MyLittleBrother
I believe it is a natural curse caused by his act of self reincarnation as that likely falls outside the rules of heaven. It could also be related to where he renicarnated.
Yeetdapro:I think somebody may be jealous of his talent and cursed him and they are looking for him and it would make for an interesting plot seeing Yuan hopefully beat him up.
Everyone saying Gain should be smarter but you seem to have forgotten his background. He is an innocent and naive child before becoming a cripple, he hasn't seen the wickedness of the world. So how could he deduce that some foul play has happen to him when he has been feed nothing but music. Truly is sad that these people saying someone should be smarter when you aren't even smart enough to have some empathy and remember his background. I suggest rereading back and pay attention to Yuan's Earth life..